Andreessen is the biggest fish there is in Valley right now. He's on the board of Facebook and HP. He's already a huge investor in startups through his VC firm, Andreessen Horowitz, and he still has billions more to seed.

In this CNBC clip, Andreessen says he supports Romney because he is a "dyed-in-the-wool" businessman who understand that "regulations" get in the way of business.

Andreessen says he used to support Democrats – like Clinton/Gore, for example – but "I turned 40 last year and so I figured it was time to make the switch."

It should be said that Andreessen disagrees with Romney's views on China.